PJB-2023-427
Influence of light quality on photosynthesis and plant morphology of Polygonatum cyrtonema Hua and Polygonatum sibiricum Delar. ex Redoute
Jun Liu, Mian-Yan Mei, An-Na He, Bo-Hui Xiong, Yi-Xin Liang, Bin Liang and Sheng-Hua Li
DOI:10.30848/PJB2025-3(35)
Abstract
The subterranean tubers of Polygonatum cyrtonema Hua and Polygonatum sibiricum Delar.ex Redoute are the source of the traditional Chinese medicinal herb Huangjing. This study investigates the impact of light quality on the nursery cultivation of Huangjing herb. Seedlings of P. cyrtonema and P. sibiricum were exposed to treatments of white, red, and blue light. Gas exchange and chlorophyll fluorescence data were collected by Li-6400 photosynthesis meter, chlorophyll content was quantified through 95% ethanol extraction, and leaf morphology data were recorded. The results indicated that these two species of herb Huangjing exhibited the highest overall Pn-PAR curves and the maximum net photosynthetic rate (Pn) in the blue light group. The Pn exhibited a significant positive correlation with photosynthetically active radiation (PAR) and a negative correlation with intercellular carbon dioxide concentration (Ci). The total chlorophyll content of the plants was highest in the blue light group and lowest in the red light group. Two species of the herb Huangjing exhibited the greatest growth in underground tubers under blue light treatment, whereas plants displayed weakness and mortality under red light treatment. Chlorophyll content exhibited a highly significant positive correlation with electron transfer rate (ETR), PSII effective electron yield (ФPSII), and the growth of subterranean tubers. The blue light treatment significantly enhanced the chlorophyll content, electron transport rate (ETR), and subterranean tuber development of the herb Huangjing. Both species of the herb Huangjing exhibit a pronounced capacity to harness blue light. P. cyrtonema is particularly suited to blue light. Utilizing a substantial proportion of blue light is advisable for the cultivation of P. cyrtonema and P. sibiricum in facilities
To Cite this article:
Liu, J., M.Y. Mei, A.N. He, B.H. Xiong, Y.X. Liang, B. Liang and S.H. Li. 2025. Influence of light quality on photosynthesis and plant morphology of Polygonatum cyrtonema Hua and Polygonatum sibiricum Delar. ex Redoute. Pak. J. Bot., 57(3): DOI: http://dx.doi.org/10.30848/PJB2025-3(35)
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